/Engine/Source/Developer/ShaderCompilerCommon/Public/SpirvCommon.h
Returns word offset to the entry point (OpEntryPoint) and name of the entry point (OpName). If the respective entry has not been found, the output offset is 0.
void FindOffsetToSpirvEntryPoint ( const [FSpirv](API\Developer\ShaderCompilerCommon\FSpirv) & Spirv, const ANSICHAR * EntryPointName, uint32 & OutWordOffsetToEntryPoint, uint32 & OutWordOffsetToMainName )